C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/24.7
C25D 11/10 (2006.01) B41N 3/03 (2006.01) C25D 11/06 (2006.01) C25D 11/12 (2006.01)
Patent
CA 1190510
ABSTRACT OF THE DISCLOSURE A process is disclosed for anodically oxidizing materials in the form of sheets, foils or strips, comprising aluminum or aluminum alloys, in an aqueous-electrolyte which contains at least 0.05% by weight of at least one polybasic organic acid, if appropriate after a foregoing mechanical, chemical and/or electrochemical roughening, in which the polybasic organic acid is poly- meric and is selected from the group consisting of phosphonic acid, sulfonic acid and carboxylic acid. The resulting anodized and sealed metal sheets have improved corrosion resistance and are especially suitable for lithography. Lithographic sheets made by this invention exhibit improved adhesion for light sensitive coating, improved run length, and lessened wear on the press, greater shelf life and improved hydrophilicity in non-image areas.
386628
Gillich Thomas N.
Rozell William J.
Walls John E.
Wanat Stanley F.
American Hoechst Corporation
Fetherstonhaugh & Co.
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